Abstract
Objective
The objective of the study was to investigate the left ventricular (LV) myocardial perfusion and metabolism in patients with idiopathic dilated cardiomyopathy (DCM) and to identify the scintigraphic predictors of the efficacy of cardiac resynchronization therapy (CRT).
Methods
The study comprised 63 patients with DCM and severe heart failure (NYHA class III–IV). Before CRT, all patients received gamma-scintigraphy with 99mTc-methoxyisobutylisonitrile (99mTc-MIBI) and with 123I-β-methyl-iodophenyl pentadecanoic acid (123I-BMIPP) for evaluation of myocardial perfusion and metabolism, respectively. Before and after 6 months of CRT, all patients underwent echocardiography study to assess cardiac hemodynamics.
Results
After 6 months of CRT, patients were divided into two groups: group 1 comprised responders in whom LV end systolic volume (LVESV) decreased by ≥15 % (n = 39); group 2 comprised non-responders in whom LVESV decreased by <15 % (n = 24). Before CRT, LV pumping function did not significantly differ between groups. Significant differences were found in the following preoperative scintigraphic parameters: myocardial perfusion defect size [7.4 % (5.9; 13.2) % and 11.8 (8.8; 16.2) %, p < 0.05] and metabolic defect size [7.4 (4.4; 14.7) % and 8.8 (8.8; 17.6) %, p < 0.05]. Metabolic scintigraphy showed greater diagnostic efficacy in determining the indications for CRT compared with perfusion scintigraphy [areas under the ROC curves (AUC) of 0.722 and 0.612, respectively]. The best metabolic defect size threshold value of 7.35 % predicted CRT efficacy with the sensitivity and specificity rates of 77.8 and 66.7 %, respectively.
Conclusion
Data of metabolic scintigraphy may be useful for the integrated prediction of CRT efficacy.
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Acknowledgments
The study was supported by the Russian Science Foundation (Grant #14-15-00178). The authors thank Dr. Stanislav M. Minin, Ph.D., Senior Research Fellow of the Department of Nuclear Medicine, Federal State Budgetary Scientific Institution, Research Institute for Cardiology, for the methodological assistance and contribution to the generation of research material.
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Zavadovsky, K.V., Gulya, M.O., Lishmanov, Y.B. et al. Perfusion and metabolic scintigraphy with 123I-BMIPP in prognosis of cardiac resynchronization therapy in patients with dilated cardiomyopathy. Ann Nucl Med 30, 325–333 (2016). https://doi.org/10.1007/s12149-016-1064-0
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DOI: https://doi.org/10.1007/s12149-016-1064-0